钛合金动态塑性变形过程中绝热剪切带的形成机理

doi:10.11896/cldb.19070111

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Abstract The plastic deformation of the material is called dynamic plastic deformation when the strain rate is higher than 10² s^-1. In comparison with quasi-static plastic deformation, the dynamic plastic deformation involves highly localized deformation and more complex mechanisms which can have a significant impact on the properties and life of materials. As a special deformation structure in the process of dynamic plastic deformation, adiabatic shear band has attracted great attention because of its influence on material properties. Because of its excellent mechanical properties, titanium alloy is widely used in many industries as structural material. Because of its wide application, titanium alloy will often face failure caused by adiabatic shear band formation in dynamic load, so as to reduce and shorten the service life. Therefore, the study on the formation mechanism of adiaba-tic shear band in titanium alloy is of great significance to prolong the service life of titanium alloy and improve the mechanical properties of titanium alloy.
However,due to the transient of dynamic plastic deformation and the complexity of internal stress, it is difficult to reappear the formation of adiabatic shear band. Meanwhile the complexity of the structure and the instability of phase in the process of deformation increase the difficulty of observing the adiabatic shear band in titanium alloy.
Through a large number of experimental observation and simulation calculation, it is generally believed that the formation mechanism of adiaba-tic shear band in titanium alloy is dynamic recrystallization. At present, there are four mainstream viewpoints in the process of dynamic recrystallization, namely, traditional dynamic recrystallization, continuous dynamic recrystallization, twin dynamic recrystallization and phase transformation induced dynamic recrystallization.According to different dynamic recrystallization methods, the researchers established the basic deformation mo-del and theoretical basis, and found some experimental evidence.
In this review, some typical research results reported in recent years dealing with the adiabatic shear bands about their morphology, properties and related formation mechanisms in titanium alloys subjected to dynamic plastic deformation are summarized. Typical formation mechanisms of adiabatic shear bands and related problems for titanium alloys are discussed so as to provide useful information for future research.

Key words： titanium alloy dynamic plastic deformation dynamic recrystallization adiabatic shear band

Published: 19 February 2021

CLC number:

TG146

Fund:This work was financially supported by National Natural Science Foundation of China(51171004).

About author:: Zikun Huang graduated from Beijing Institute of Technology in June 2015 with a bachelor's degree in engineering. He is currently a doctoral student in the Department of Materials and Manufacturing, Beijing University of Technology, under the guidance of Professor Sun Wei. At present, the main research field is the plastic deformation mechanism and microstructure evolution of metastable β titanium alloy.
Wei Sun, professor, doctoral supervisor. He graduated from the Department of Metal Physics from Northeastern University in 1984 and received a master's degree from the Department of Metal Materials from the same university in 1987. In 1994, he completed his doctoral program in the Graduate School of Engineering, Tohoku University, Japan, and received a doctorate in material science. From 1994 to 1997, he won the special award research fund for postdoctoral fellows of the National Research Institute of the Ministry of Science and Technology of Japan, and served as a special researcher of science and technology in the Institute of Metal Materials Technology of the Agency of Science and Technology. From 1997 to 1998, he worked as an assistant researcher in the Physics Department of the University of Virginia. In december 1998, he was employed as a formal educational science instructor by the Institute of Metal Materials, Tohoku University, Japan. In december 2003, he was hired as a special professor in Beijing to return to work.

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Cite this article:

HUANG Zikun,SUN Wei. Formation Mechanism of Adiabatic Shear Band in Dynamic Plastic Deformation of Titanium Alloy[J]. Materials Reports, 2021, 35(3): 3122-3128.

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http://www.mater-rep.com/EN/10.11896/cldb.19070111 OR http://www.mater-rep.com/EN/Y2021/V35/I3/3122

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